diff options
Diffstat (limited to 'REORG.TODO/sysdeps/i386/fpu/fedisblxcpt.c')
-rw-r--r-- | REORG.TODO/sysdeps/i386/fpu/fedisblxcpt.c | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/i386/fpu/fedisblxcpt.c b/REORG.TODO/sysdeps/i386/fpu/fedisblxcpt.c new file mode 100644 index 0000000000..f8db665425 --- /dev/null +++ b/REORG.TODO/sysdeps/i386/fpu/fedisblxcpt.c @@ -0,0 +1,54 @@ +/* Disable floating-point exceptions. + Copyright (C) 1999-2017 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Andreas Jaeger <aj@suse.de>, 1999. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <http://www.gnu.org/licenses/>. */ + +#include <fenv.h> +#include <unistd.h> +#include <ldsodefs.h> +#include <dl-procinfo.h> + +int +fedisableexcept (int excepts) +{ + unsigned short int new_exc, old_exc; + + /* Get the current control word. */ + __asm__ ("fstcw %0" : "=m" (*&new_exc)); + + old_exc = (~new_exc) & FE_ALL_EXCEPT; + + excepts &= FE_ALL_EXCEPT; + + new_exc |= excepts; + __asm__ ("fldcw %0" : : "m" (*&new_exc)); + + /* If the CPU supports SSE we set the MXCSR as well. */ + if (HAS_CPU_FEATURE (SSE)) + { + unsigned int xnew_exc; + + /* Get the current control word. */ + __asm__ ("stmxcsr %0" : "=m" (*&xnew_exc)); + + xnew_exc |= excepts << 7; + + __asm__ ("ldmxcsr %0" : : "m" (*&xnew_exc)); + } + + return old_exc; +} |